import std.stdio, std.string, std.conv;
import std.range, std.algorithm, std.array, std.typecons, std.container;
import std.math, std.numeric, core.bitop;


void main() {
    long n;
    scan(n);
    writeln(gcd(n, n*(n-1)/2));
}





struct UnionFind {
    private {
        int _size;
        int[] _parent;
        int _numcc;
    }

    this(int N) 
    in {
        assert(N > 0);
    }
    body {
        _size = N;
        _numcc = N;
        _parent = new int[](_size);
        foreach (i ; 0 .. _size) {
            _parent[i] = i;
        }
    }

    int findRoot(int x)
    in {
        assert(0 <= x && x < _size);
    }
    body {
        if (_parent[x] != x) {
            _parent[x] = findRoot(_parent[x]);
        }

        return _parent[x];
    }

    bool same(int x, int y)
    in {
        assert(0 <= x && x < _size);
        assert(0 <= y && y < _size);
    }
    body {
        return findRoot(x) == findRoot(y);
    }

    void merge(int x, int y)
    in {
        assert(0 <= x && x < _size);
        assert(0 <= y && y < _size);
    }
    body {
        int u = findRoot(x);
        int v = findRoot(y);

        if (u == v) return;

        _parent[v] = u;
        _numcc--;
    }

    int numcc() {
        return _numcc;
    }
}



































void scan(T...)(ref T args) {
    import std.stdio : readln;
    import std.algorithm : splitter;
    import std.conv : to;
    import std.range.primitives;

    auto line = readln().splitter();
    foreach (ref arg; args) {
        arg = line.front.to!(typeof(arg));
        line.popFront();
    }
    assert(line.empty);
}



void fillAll(R, T)(ref R arr, T value) {
    static if (is(typeof(arr[] = value))) {
        arr[] = value;
    }
    else {
        foreach (ref e; arr) {
            fillAll(e, value);
        }
    }
}